990-05-50-02-05 Bently Nevada 990 Vibration Transmitter

Product Introduction

The Bently Nevada 990-05-50-02-05 represents a reliable solution for continuous vibration monitoring. This 990 Vibration Transmitter integrates seamlessly with the 3300 NSv Proximity Probe system. It provides a direct 4-20 mA output proportional to shaft vibration. Consequently, it serves as a critical component in predictive maintenance strategies. The device is manufactured in the U.S.A. and adheres to stringent quality standards.

Specifically, the 990-05-50-02-05 features a full-scale option of 0-5 mils pp (0-125 μm pp). This range makes it suitable for detecting subtle changes in rotating machinery. Furthermore, its design incorporates non-interacting zero and span adjustments. This simplifies the calibration process significantly. The transmitter's rugged construction ensures reliable performance in demanding industrial environments.

Technical Specifications

Performance and Accuracy

The 990-05-50-02-05 delivers a 4 to 20 mAdc signal over its specified full-scale range. This output operates within a 2-wire configuration. Moreover, its loop accuracy is rated within ±1.5% over the full scale. This accuracy measurement is taken from the TEST signal input to a 250 Ω loop resistance. For instance, this precision allows for dependable machine condition assessment. The unit also includes a "NOT OK" signal defeat feature. If a fault occurs, the output drops below 3.6 mA within 100 µs. The signal then restores automatically 2-3 seconds after the fault clears.

Power and Connectivity

This model requires a +12 to +35 Vdc power input at the transmitter terminal. Consequently, the maximum loop resistance is 1,000 Ω, including cable, at 35 Vdc. The typical current limiting is 23 mA. Meanwhile, the frequency response spans from 5 Hz to 6,000 Hz (+0, 3 dB). This broad response captures a wide range of vibration frequencies. Additionally, it accepts one non-contacting 3300 NSv Proximity Probe and extension cable.

Physical and Environmental

The Bently Nevada 990-05-50-02-05 weighs approximately 0.43 kg (0.9 lbm). Its design facilitates easy installation in various locations. For instance, the system length option is 5.0 meters (16.4 feet). The mounting option uses bulkhead screws for secure attachment. Furthermore, the transmitter is built to withstand harsh conditions. It carries significant agency approvals, including CSA Division 2, ATEX Zone 0, and ATEX Zone 2. Additionally, it includes ABS maritime approval for marine applications. The minimum target size required is 9.5 mm (0.375 in) in diameter.

Installation Guidelines

Proper installation is crucial for the 990 Vibration Transmitter to operate effectively. First, ensure the probe is gapped correctly between 0.5 and 1.75 mm (20 and 55 mils) from the target. This gap is essential for achieving the full-scale range. Next, connect the power supply, ensuring it provides between +12 and +35 Vdc. Remember that the maximum leadwire length for the Proximitor Sensor Output (BNC connector) is 3 meters (10 feet). Use the external adjustments to set zero and span without interference. Finally, secure the unit using the bulkhead screws provided. This straightforward process ensures reliable operation.

Packaging List

The product package includes the following items:

• Bently Nevada 990-05-50-02-05 Vibration Transmitter (1 unit)

• Mounting hardware (bulkhead screws)

• Product documentation and quick-start guide

Please note: The proximity probe, extension cable, and power supply are not included in this package and must be purchased separately.

Frequently Asked Questions (FAQ)

1. What is the full-scale range of the 990-05-50-02-05?
The Bently Nevada 990-05-50-02-05 has a full-scale option of 0-5 mils pp, which is equivalent to 0-125 μm pp.

2. What are the agency approvals for this vibration transmitter?
This transmitter holds CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime approvals, making it suitable for hazardous and marine environments.

3. What is the required power supply for this model?
The 990-05-50-02-05 requires a DC input voltage between +12 and +35 Vdc at the transmitter terminal.

4. How does the "NOT OK" condition affect the output?
The signal output drops to less than 3.6 mA within 100 µs after a Not OK condition. It automatically restores within 2-3 seconds after the condition is resolved.

5. What is the maximum loop resistance for this device?
The maximum loop resistance is 1,000 Ω, including the cable, when operating at 35 Vdc. This ensures compatibility with most control systems.